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Error: (07/03/2014 08:40:51 AM) (Source: Application Hang) (User: )
Description: The program dota.exe version 0.0.0.0 stopped interacting with Windows and was closed. To see if more information about the problem is available, check the problem history in the Action Center control panel.

The others indicate there may be issues with your power supply and/or your RAM. As for the RAM, try running either Windows Memory Diagnostics (http://windows.microsoft.com/en-US/windows7/Diagnosing-memory-problems-on-your-computer) or downloading and copying Memtest86 to a CD and running that (http://www.memtest.org). As for the power supply, testing that will involve shutting down the PC and removing it. Because power supplies contain dangerous amounts of voltage even when turned off, if you aren't comfortable doing this yourself take it somewhere to have it tested. If you are, you'll need a power supply tester or multimeter. http://pcsupport.about.com/od/toolsofthetrade/f/powersupplytest.htm

You may also want to boot into safe mode and see if the issues persist. If they do, while still in safe mode, open a command prompt window by typing cmd in the search box, then right clicking and selecting Run as administrator, and typing sfc /scannow.